Moved from the Discord thread.
What features will 12- accounts be able to use?
12- accounts will pretty much have all features of a normal account, with the exception of some settings, which are only available using parental controls, as all 12- accounts must be linked with an adult account.
Okie Dokie 
I made a new part for user data files in the server
child: Whether the user is under the age of 13
linked_guardian: User ID of linked parent/guardian account
account_disabled: Whether the parent/guardian disabled the account
filter_level: What filter list to use when sending posts back to client (0: None, 1: Moderate, 2: Strict)
user_whitelist: Whether the child can only talk to users the guardian has whitelisted
community_whitelist: Whether the child can only be in communities the guardian has whitelisted
groups_enabled: Whether the child can be in group chats
encrypted_chats: Whether the child can be in end-to-end encrypted chats
allowed_users: Users that are whitelisted
blocked_users: Users that the child cannot interact with (even when whitelist mode is off)
allowed_communities: Communities that are whitelisted
blocked_communities: Communities that the child cannot interact with (even when whitelist mode is off)
Make sure that is privately stored 
Closing due to this being outdated. Please look for Release details about COPPA compliance.